18440352631 has 2 divisors, whose sum is σ = 18440352632. Its totient is φ = 18440352630.

The previous prime is 18440352571. The next prime is 18440352677. The reversal of 18440352631 is 13625304481.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18440352631 is a prime.

It is a super-2 number, since 2×18440352631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18440352031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9220176315 + 9220176316.

It is an arithmetic number, because the mean of its divisors is an integer number (9220176316).

Almost surely, 2^18440352631 is an apocalyptic number.

18440352631 is a deficient number, since it is larger than the sum of its proper divisors (1).

18440352631 is an equidigital number, since it uses as much as digits as its factorization.

18440352631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 18440352631 in words is "eighteen billion, four hundred forty million, three hundred fifty-two thousand, six hundred thirty-one".